From f1774fa049afc6f35192ff0f60ac5486cd9d3b08 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Thu, 18 Apr 2019 15:36:59 +1000
Subject: [PATCH] stm32/system_stm32f0: Enable PWR clock on startup.

To be consistent with how F4/F7/H7/L4 works in system_stm32.c.  The power
control peripheral is needed at least for the RTC.
---
 ports/stm32/system_stm32f0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ports/stm32/system_stm32f0.c b/ports/stm32/system_stm32f0.c
index 9d4b06e568..afabdb667f 100644
--- a/ports/stm32/system_stm32f0.c
+++ b/ports/stm32/system_stm32f0.c
@@ -129,6 +129,9 @@ void SystemInit(void) {
 }
 
 void SystemClock_Config(void) {
+    // Enable power control peripheral
+    __HAL_RCC_PWR_CLK_ENABLE();
+
     // Set flash latency to 1 because SYSCLK > 24MHz
     FLASH->ACR = (FLASH->ACR & ~0x7) | 0x1;